Patent RU-2713470-C1 (RU)
Title: Non-contact stabilized ac generator with combined excitation
Inventor: MYTSYK GENNADIJ SERGEEVICH
IPC: H02P9/30
Filed: 2019-05-30
Granted: 2020-02-05
Abstract: FIELD: electrical engineering. 
     SUBSTANCE: invention relates to electrical engineering and can be used in construction of alternating and direct current generators for power supply systems of independent objects, primarily for aircrafts, where minimum possible weight, dimensions and contactlessness are required, as well as in wind power engineering. Non-contact voltage-stabilized alternating current generator with combined excitation (CMEG) comprises permanent magnet (1) providing uncontrolled excitation of generator, non-magnetic bushing (2), shaft of generator (3), combined ring-band (4) made by welding from parts of magnetically conductive and magnetically non-conductive materials. Elements (1, 2, 4) form main inductor (MI). Additional inductor (AI) comprises magnetic conductor (5) (in form of magnetically conductive bushing with protrusions-poles), pole magnetic conductive tip (6), fixed by welding through magnetically non-conductive parts (same shape) with magnetically conductive tips with projections (7), assembled into ring by welding alternating between magnetically conductive and magnetically nonconducting tips (rectangular and special shape), double-wall annular magnetic-conductive structure (8) (of double-wall pan type) for placement of excitation winding (9) (with terminals (9 + ), (9 - )), sleeve (ring) (10) from magnetically non-conductive material. Thus, AI includes elements (5)÷(9). To measure CMEG voltage, which is proportional to shaft rotation frequency, its structure is equipped with three-phase measuring winding with leads (11), which is laid in slots of main magnetic conductor (12). Additional magnetic conductor (13) of the stator is located under AI and from the main magnetic conductor (12) is separated by a magnetically non-conducting (air gap), considerably larger than the main working gap. In grooves of magnetic conductors (12), (13) common anchor winding (14) is laid. Magnetic conductors (12), (13) are located in housing (15) from magnetically non-conductive material. Assembly into single structure of housing with stator and main and additional inductors arranged on shaft (3) is performed by means of covers (16), (17) and bearings (18), (19). Three-phase armature winding (14) is equipped with power terminals (20) for load connection to it. Measuring winding (11) is connected to input of measuring rectifier (21), which outputs signal U n , which is proportional to shaft rotation frequency, which is supplied to CS VRU (22) input, which includes power part (23) and control system (CS) (24). Power part (23) includes series-connected units: rectifier (25) and inverter by half-bridge circuit (MIM) (26) with capacitor voltage divider (27), (28) and two transistors (29), (30), shunt diodes. Control inputs of transistors (29), (30) through drivers (31) are connected to corresponding outputs CS (24). Drivers (31) provide galvanic decoupling and amplification of transistor control signals. Primary winding (32) of matching transformer is connected to output of inverter (26), and its two secondary windings (33) together with two diodes (34) form a rectifier in zero circuit. Its output is connected to power input PTB (35), which is made in bridge circuit on transistors (36)÷(39). Their control inputs are connected via drivers (40) to corresponding outputs CS (24). Voltage regulation unit (VRU) operation logic is defined by the CMEG variable shaft rotation frequency. 
     EFFECT: improvement of mass and dimensions parameters at increase of efficiency and increase of energy efficiency of process of voltage stabilization at variable frequency of shaft rotation. 
     4 cl, 4 dwg